STMicroelectronics T610T-8T

Overview

T610T-8T from STMicroelectronics is a 6 A RMS, 800 V repetitive peak off-state voltage logic-level triac in TO-220AB package, designed for AC line switching and phase-angle control. It features 10 mA gate trigger current, three-quadrant operation, and 100 A/µs critical rate of rise of on-state current, enabling direct microcontroller drive in motor control and lighting circuits.

For engineers reviewing the T610T-8T datasheet, T610T-8T pinout, T610T-8T application, or T610T-8T equivalent, key selection criteria include gate sensitivity (IGT ≤ 10 mA), blocking voltage (VDRM = 800 V), thermal resistance (Rth(j-c) = 2.1 °C/W), and ECOPACK2 compliance for industrial-grade reliability.

Technical Context

This triac operates across all four quadrants but is optimized for three-quadrant triggering (Quadrants I, II, and III), reducing false triggering in noisy AC environments. Its low 10 mA IGT and 1.3 V VGT enable compatibility with 3.3 V and 5 V logic outputs without external amplification.

With 900 V non-repetitive surge capability (VRSM), 45 A non-repetitive surge current (ITSM at 50 Hz), and 13 A²s I²t rating, it supports robust inrush current handling and overvoltage crowbar protection in mains-connected appliances.

Key Specifications

Pinout & Package

Delivered in TO-220AB package with isolated mounting tab (A2 terminal), this triac uses standard through-hole mounting and supports 260 °C soldering for 10 s. The case serves as the A2 (main terminal 2) connection and must be electrically isolated unless used as heatsink return path.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triac-based AC switching applications.

Compared with BTB16-800CW and MAC12A8G, the T610T-8T uniquely balances low gate drive (10 mA), three-quadrant noise immunity, and 6 A thermal capability in an ECOPACK2-compliant TO-220AB, making it optimal for space-constrained, microcontroller-driven AC switching where reliability and simplicity are prioritized over raw current headroom.

Availability

T610T-8T is available at Aetrix Electronics and suitable for motor control, lighting dimming, and small home appliance switching requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for T610T-8T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The T610T-8T belongs to ST's high-reliability triac product line engineered specifically for robust, logic-compatible AC power control in cost-sensitive, high-volume appliances and industrial equipment.

FAQ

Is the T610T-8T compatible with 3.3 V microcontrollers?

Yes. With a maximum gate trigger current (IGT) of 10 mA and typical VGT of 1.3 V, the T610T-8T can be directly driven by 3.3 V GPIO pins using a series resistor ≤330 Ω. Its three-quadrant operation further reduces risk of false triggering under partial-voltage conditions common in 3.3 V systems.

Does the TO-220AB package provide electrical isolation between the tab and leads?

No. In the TO-220AB variant used for T610T-8T, the metal tab is internally connected to A2 (MT2) and is not electrically isolated. Designers must either insulate the tab from the heatsink using mica washers or assign A2 as the system ground reference to avoid short circuits.

What is the minimum dV/dt immunity at elevated temperature?

At Tj = 150 °C, the guaranteed minimum static dV/dt immunity is 170 V/µs (tested at VD = 402 V, gate open). This value is confirmed in Table 2 of DS10318 Rev 2 and ensures stable blocking behavior in hot, high-noise environments such as enclosed motor drives.

Can the T610T-8T replace a relay in a 230 VAC, 5 A resistive load application?

Yes. With 6 A IT(RMS) rating, 800 V VDRM, and 2.1 °C/W Rth(j-c), it sustains 5 A continuously at Tc ≤ 115 °C using a standard 15 cm² aluminum heatsink. Its solid-state nature eliminates mechanical wear, bounce, and audible noise-ideal for silent, high-cycle-count relay replacement.